ojquery.0.1 not compatible with jsoo >= 2.4 

due to https://github.com/ocsigen/js_of_ocaml/commit/36dc6d2593530fcd7a4157743b09b2c722225df3
Merge pull request #2708 from hhugo/patch-1

ojquery.0.1 not compatible with jsoo >= 2.4